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class="sidebar-link">集成到iOS应用</a></li><li><a href="/zh/guide/develop/weex_error_code.html" class="sidebar-link">WEEX常见错误码</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>调试</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/debug/integrate-devtool-to-android.html" class="sidebar-link">集成Devtool到Android</a></li><li><a href="/zh/guide/debug/integrate-devtool-to-ios.html" class="sidebar-link">集成Devtool到iOS</a></li><li><a href="/zh/guide/debug/debug.html" class="sidebar-link">调试</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>扩展</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/extend/extend-android.html" class="sidebar-link">扩展Android能力</a></li><li><a href="/zh/guide/extend/extend-ios.html" class="sidebar-link">扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-ios-with-swift.html" class="sidebar-link">使用Swift扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-web.html" class="sidebar-link">扩展Web组件</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>高阶特性</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/advanced/asset-path.html" class="sidebar-link">资源路径</a></li><li><a href="/zh/guide/advanced/downgrade.html" class="sidebar-link">降级方案</a></li><li><a href="/zh/guide/advanced/use-vuex-and-vue-router.html" class="sidebar-link">使用Vuex和vue-router</a></li><li><a href="/zh/guide/advanced/multi-size-screen.html" class="sidebar-link">适应不同尺寸屏幕</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>贡献</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/contribute/how-to-contribute.html" class="sidebar-link">加入 Weex 社区</a></li><li><a href="/zh/guide/contribute/thanks.html" class="sidebar-link">鸣谢</a></li></ul></div></li></ul></div><div class="page"><div class="content"><h1 id="weex-和-web-的平台差异"><a href="#weex-和-web-的平台差异" class="header-anchor">#</a> Weex 和 Web 的平台差异</h1><p>Weex 是一个跨平台解决方案，Web 平台只是其一种运行环境，除此之外还可以在 Android 和 iOS 客户端中运行。原生开发平台和 Web 平台之间的差异，在功能和开发体验上都有一些差异。</p><h2 id="weex-环境中没有-dom"><a href="#weex-环境中没有-dom" class="header-anchor">#</a> Weex 环境中没有 DOM</h2><p>DOM（Document Object Model），即文档对象模型，是 HTML 和 XML 文档的编程接口，是 Web 中的概念。Weex 的运行环境以原生应用为主，在 Android 和 iOS 环境中渲染出来的是原生的组件，不是 DOM Element。</p><h3 id="不支持-dom-操作"><a href="#不支持-dom-操作" class="header-anchor">#</a> 不支持 DOM 操作</h3><p>原生环境中不支持 Web API，没有 <code>Element</code> 、<code>Event</code> 、<code>File</code> 等对象，详细列表可以参考 <a href="https://developer.mozilla.org/en-US/docs/Web/API" target="_blank" rel="noopener noreferrer">Web APIs on MDN<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a>。不支持选中元素，如 <code>document.getElementById</code> 、 <code>document.querySelector</code> 等；当然也不支持基于 DOM API 的程序库（如 jQuery）。</p><h3 id="有限的事件类型"><a href="#有限的事件类型" class="header-anchor">#</a> 有限的事件类型</h3><p>Weex 支持在标签上绑定事件，和在浏览器中的写法一样，但是 Weex 中的事件是由原生组件捕获并触发的，行为和浏览器中有所不同，事件中的属性也和 Web 中有差异。</p><ul><li>支持 Web 中的事件类型，详情请参考<a href="/zh/docs/events/common-events.html">《通用事件》</a>。</li><li>不区分事件的捕获阶段和冒泡阶段，相当于 DOM 0 级事件。</li></ul><h2 id="weex-环境中没有-bom"><a href="#weex-环境中没有-bom" class="header-anchor">#</a> Weex 环境中没有 BOM</h2><p>BOM（Browser Object Model），即浏览器对象模型，是浏览器环境为 javascript 提供的接口。Weex 在原生端并不基于浏览器运行，不支持浏览器提供的 BOM 接口。</p><h3 id="没有-window-、screen-对象"><a href="#没有-window-、screen-对象" class="header-anchor">#</a> 没有 <code>window</code> 、<code>screen</code> 对象</h3><p>Weex 中并未提供浏览器中的 <code>window</code> 和 <code>screen</code> 对象，不支持使用全局变量。如果是想要获取设备的屏幕或环境信息，可以使用 <code>WXEnvironment</code> 变量。</p><ul><li><code>WXEnvironment</code><ul><li><code>weexVersion</code>: WeexSDK 的版本。</li><li><code>appName</code>: 应用的名称。</li><li><code>appVersion</code>: 应用的版本。</li><li><code>platform</code>: 运行平台，可能的值是 <code>Web</code> 、<code>Android</code> 、<code>iOS</code> 之一。</li><li><code>osName</code>: 系统的名称。</li><li><code>osVersion</code>: 系统版本。</li><li><code>deviceWidth</code>: 设备宽度。</li><li><code>deviceHeight</code>: 设备高度。</li></ul></li></ul><h3 id="没有-document-对象"><a href="#没有-document-对象" class="header-anchor">#</a> 没有 <code>document</code> 对象</h3><p>在浏览器中 <code>document</code> 表示了当前活动的文档模型，在 Android 和 iOS 环境中并没有这个对象，也不支持与其相关的 DOM 操作。</p><h3 id="没有-history-、location-、navigator-对象"><a href="#没有-history-、location-、navigator-对象" class="header-anchor">#</a> 没有 <code>history</code> 、<code>location</code> 、<code>navigator</code> 对象</h3><ul><li><code>history</code> 保存了当前页面的历史记录，并且提供了前进后退操作。</li><li><code>location</code> 记录了当前页面 URL 相关的信息。</li><li><code>navigator</code> 记录了当前浏览器中的信息。</li></ul><p>这些接口与浏览器自身的实现有关，可以控制页面的前进后退并且获取状态信息。虽然在 Android 和 iOS 中也有“历史”和“导航”的概念，但是它是用于多个管理视图之间的跳转的。换句话说，在浏览器中执行“前进”、“后退”仍然会处于同一个页签中，在原生应用中“前进”、“后退”则会真实的跳转到其他页面。</p><p>此外 Weex 也提供了 <code>navigator</code> 模块来操作页面的跳转，使用方法参考<a href="/zh/docs/modules/navigator.html">《navigator 导航控制》</a>。</p><h2 id="能够调用移动设备原生-api"><a href="#能够调用移动设备原生-api" class="header-anchor">#</a> 能够调用移动设备原生 API</h2><p>在 Weex 中能够调用移动设备原生 API，使用方法是通过注册、调用模块来实现。其中有一些模块是 Weex 内置的，如 clipboard 、 navigator 、storage 等。</p><ul><li><a href="/zh/docs/modules/clipboard.html">《clipboard 剪切板》</a></li><li><a href="/zh/docs/modules/navigator.html">《navigator 导航控制》</a></li><li><a href="/zh/docs/modules/storage.html">《storage 本地存储 》</a></li></ul><p>为了保持框架的通用性，Weex 内置的原生模块有限，不过 Weex 提供了横向扩展的能力，可以扩展原生模块，具体的扩展方法请参考<a href="/zh/guide/extend/extend-ios.html">《iOS 扩展》</a> 和<a href="/zh/guide/extend/extend-android.html">《Android 扩展》</a>。</p><blockquote><p>有些接口在浏览器环境中也存在，不过在使用时应该注意浏览器的兼容性；如剪贴板功能，出于安全性考虑，绝大多数浏览器都限制其使用。</p></blockquote></div><div class="page-nav"><p class="inner"><span class="prev"> |
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